Dashboard illumination lights failng

[jwlshort]

Hi,

I have a problem with my '98 4.0L Xj8. The back illumination on the dashboard seems to be failing in 2 places. These are behind the Defrost button and the rear screen Demist button.

Another issue is that since noticing the above I see that there is no blue green illumination around the J gate. YOu still get the letters and numbers illuminating redf when the gear selecter is in that position though. The only thing is that I can't remember if the J gate did ever light up blue green or not. Can anyon put me straight on that?

So, I was wondering if anyone had any tips about the dashboard lights e,g,

are they individual LEDs or is a some kind of light pipe?
is it a difficult job to replace the lights - any tips welcome?

Any pointers greatly appreciated.